<!DOCTYPE html>
<html>
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<head><title>flexbox | flex formatting context :: float intrusion</title>
<link href="http://opera.com/" rel="author" title="Opera Software">
<link href="http://www.w3.org/TR/css-flexbox-1/#flex-containers" rel="help">
<link href="http://test.csswg.org/suites/css-flexbox-1_dev/nightly-unstable/html/reference/flexbox_fbfc2-ref.htm" rel="match">
<style>
* {margin: 0;}
#float {
	background: lightblue;
	width: 200px;
	float: left;
}
#flex {
	background: #ffcc00;
	margin-left: -200px;
	width: 400px;
	display: flex;
}
div div {
	margin: 2em;
}
</style>

</head><body><div id="float">float</div>

<div id="flex">
	<div>Yellow box yellow box yellow box</div>
</div>
</body>
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</html>